With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwUserGrpCreatedSessions
Cisco's ASN Gateway User Group Created Sessions
1.3.6.1.4.1.9.9.638.1.3.4.1.1.3
Total number of sessions created per user group.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwUserGrpCreatedSessions on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.